package com.v.mapreduce2;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;

public class WordCountDriver {
    public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException {

        //1.获取job任务
        Configuration configuration = new Configuration();
        Job job = Job.getInstance(configuration);

        //2.设置jar包路径
        job.setJarByClass(WordCountDriver.class);

        //3.连通mapper和reducer
        job.setMapperClass(WordCountMapper.class);
        job.setReducerClass(WordCountReducer.class);

        //4.设置mapper输出的KV类型
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);

        //5.设置map出
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        //6. 设置输入路径和输出路径
        FileInputFormat.setInputPaths(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        //7.提交任务
        boolean b = job.waitForCompletion(true);
        System.exit(b ? 0 : 1);

    }
}
